Return error codes from EvdevOpenDevice()

The server's behaviour is to stop adding new devices when a BadAlloc occurs
on any device (on the assumption that new devices won't magically have more
memory). Change EvdevOpenDevice() to return an error code of BadValue when
it fails (and thus to the server) to prevent other devices being ignored
because of one misconfigured one.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>

src/evdev.c

@@ -112,7 +112,7 @@ static void EvdevKbdCtrl(DeviceIntPtr device, KeybdCtrl *ctrl);
 static int EvdevSwitchMode(ClientPtr client, DeviceIntPtr device, int mode);
 static BOOL EvdevGrabDevice(InputInfoPtr pInfo, int grab, int ungrab);
 static void EvdevSetCalibration(InputInfoPtr pInfo, int num_calibration, int calibration[4]);
-static BOOL EvdevOpenDevice(InputInfoPtr pInfo);
+static int EvdevOpenDevice(InputInfoPtr pInfo);
 
 #ifdef HAVE_PROPERTIES
 static void EvdevInitAxesLabels(EvdevPtr pEvdev, int natoms, Atom *atoms);
@@ -1675,12 +1675,14 @@ EvdevOn(DeviceIntPtr device)
 {
     InputInfoPtr pInfo;
     EvdevPtr pEvdev;
+    int rc = Success;
 
     pInfo = device->public.devicePrivate;
     pEvdev = pInfo->private;
     /* after PreInit fd is still open */
-    if (!EvdevOpenDevice(pInfo))
-        return !Success;
+    rc = EvdevOpenDevice(pInfo);
+    if (rc != Success)
+        return rc;
 
     EvdevGrabDevice(pInfo, 1, 0);
 
@@ -2141,7 +2143,7 @@ EvdevSetCalibration(InputInfoPtr pInfo, int num_calibration, int calibration[4])
     }
 }
 
-static BOOL
+static int
 EvdevOpenDevice(InputInfoPtr pInfo)
 {
     EvdevPtr pEvdev = pInfo->private;
@@ -2152,7 +2154,7 @@ EvdevOpenDevice(InputInfoPtr pInfo)
         device = xf86CheckStrOption(pInfo->options, "Device", NULL);
         if (!device) {
             xf86Msg(X_ERROR, "%s: No device specified.\n", pInfo->name);
-            return FALSE;
+            return BadValue;
         }
 
         pEvdev->device = device;
@@ -2167,7 +2169,7 @@ EvdevOpenDevice(InputInfoPtr pInfo)
 
         if (pInfo->fd < 0) {
             xf86Msg(X_ERROR, "Unable to open evdev device \"%s\".\n", device);
-            return FALSE;
+            return BadValue;
         }
     }
 
@@ -2178,10 +2180,10 @@ EvdevOpenDevice(InputInfoPtr pInfo)
         xf86Msg(X_WARNING, "%s: device file is duplicate. Ignoring.\n",
                 pInfo->name);
         close(pInfo->fd);
-        return FALSE;
+        return BadMatch;
     }
 
-    return TRUE;
+    return Success;
 }
 
 #if GET_ABI_MAJOR(ABI_XINPUT_VERSION) < 12
@@ -2243,7 +2245,8 @@ EvdevPreInit(InputDriverPtr drv, InputInfoPtr pInfo, int flags)
     pInfo->read_input = EvdevReadInput;
     pInfo->switch_mode = EvdevSwitchMode;
 
-    if (!EvdevOpenDevice(pInfo))
+    rc = EvdevOpenDevice(pInfo);
+    if (rc != Success)
         goto error;
 
     /*